Air pump



Apr. 24; w23,

N. A. PETWY AIR PUMP Filed Feb. l, 1921 I 4 sheets-shew 1 www I /4 i "l /4 v Apr. 24, 192., N. A. PIETWY u AIR PUMP Filed Fab. 1. 19,21

4 Sheets-Sheet Z ZM@ E Zw D MMMI prz, 24, M23.,

NQ A. www

AIR PUMP Filed Feb. 1. 19521 4 SheetsnShae; 5

Apr. 221f1fy 1923. M4391? N. A. PETRY AIR PUMP 3 Filed Feb. l, 1921- fwheetS-Sheet 4 l'lateiited Idd, lila llt M i itrcnonasarn'rnr, or rn:inannnriaia, riitnvsirnnzaivia.

application filed. lehruary 1., will.. serial Natta-1,25%.

To dit @07mm it may concern flie it knownthat l, Niciiona following is a specication.

il. Pirrnr, a citizen `ot the United` States,` residing in Philade-lphia7 Pennsylvania, have invented Improvements in Air Pumps, ot which the My invention relates to certain improve .niente in air pumps particularly used :tor inflating vehicle tires and one object ot iny invention is to" provide a puinp with a toot plate having inenihes so arranged that the pump `structurecan be readily held by the feet in an easy position while hemp)` reciproeated.

the piston is `ofthe casing.` lliese ohgec -ts l `attain inthe 'following` manner. reference being had tothe accent `panving drawings, in whicln Figure 'l is a view in elevationot my iinproved pump, showing the `toot plates Figure 2 is a side view of the pump illus trated `in Fig. l

Fig. 3 is a sectional eleva-tion showing the construction oit washer g the piston` and the `cup Ll. is a sectional plan view on the line "f-lwhltig. l;

i Fig. `5 is a view siinilar to Fig'. t, showing the toot plates extended;

` "ltig: G is a `view similar to Fig. 5 with the `top plate removedto illustrate the method ot gearing one toot plate to the other;

7 is a view illustrating ainodilic tion in which each movable section inde pendently held Vh va thuinh nut;

` Figs. 8 and 9 are views oit inodilications in which 'the pivots et the toot plates are di- 4 rectly under the pninp cylinder casing;

Fig. l is a view showing" one tootplate overlappino1 the other, both plates held by a single thunrih nut;

being` Fig. ll is a view showing' one :toot plate fixed and one plate inovable. p

Figs. l2 and `13 are views showing;- an enu tended hase with independent adjustable toot plates;

14 is a view showing` another inan-4 iier of pivoting; the adjustable foot plates;

Figs. l and .16 are views showing the pivots ttorthe toot plates located under the cylinder et the puinp and a clamp plate provided with a thuinh nut toi' locking; the` l twoflioot plates in position;

llipjs. 17 and 15B are views showingl detachahle toot plates;

l? 1), 20 and 2l illustrate hinged 'toot plates; .liipi 22 illustrates a toot plate in which the two lateral extensions are set at an angle and made integral with the hase; and

Fig. 23 is a perspective view ot the handle locking` hail. i i

ltelzeirinsin the iirst instance to Figs. l to (t inclusive l is the cylinder ot the pump made in the `ordinarv manner and secured .i to hase i?, in which is a passage tor the air.

3 is an air valve easing' which is attached toa :flexible tube L having the usual couplin ,s hjv which it can he secured to the nipple `et the air valve et an inflatable tire. At the upper end ofthe casing is a cap 5 screwed `ontothe casing in the ordinary manner and in i this cap vis an air vent. Extending through the cap` is a piston rodG having' a piston 7 thereoin ltigr. 3, which is arranged to reciprocate in the casingand at the upper end of the rod o is a handle 8 having hand holds 9 ateach side5 `as clearly shown in 4llinure l.

The lower end et the rod (l is screw threaded, and `niounted on this seiew threaded :redis a disk l() `convened en its upperside as showiiin Fig. 3 end having ascrew threaded opening: to receive the screw threaded end et the rode. (lruuped against the concaved portion ot the disk Il() lip a nut 1l. and a washer is a flexible cup l2 shaped. asshown.` rllhis arrangement causes theiciip to hear against the walls ot the c vlindei` and when the plunger is descending the tendency oit the air will he to press .against the cup in the direction ot the arrow f and hold it tight against the walls oi' the cylinder and thus prevent leakage. The cup on the return stroke will readily yield,

ending at a point back of the edge ot the disk 10.

In lorder to lock the handle to the pump casing when the pump is not in use7 I provide a bail 13 (Fig. 23), having bent ends 14, which extend into openings in the cap 5 and has a reduced portion 15 which is adapted to partially encircle and clamp the handle as shown in the drawings. By simply throwing the bail back. the Ahandle is released.

` Pivotally mounted on the base 2 ot the pump are foot plates 16 which are pivoted at 17 to the base 27 and the plates have teeth 18 which intermesh so that when one foot plate is moved the other moves with it. The

toot plates when extended will be located the same distance from a center line m, Fig. =6. 19 is a clamp plate having holes through which the pivots 17 extend and also having a hole through which the screw bolt 2O extends from the base and this bolt is provided with a wing nut 21 on turningwhich the foot plates 1.6 are clamped either in the extended or retracted position. The plates may be arranged at 'different angles, depending upon the user of the pump, but I find that the angle shown in Figs. 5 and 6 accommodates the feet ot the user in a natural position and tends to keep the pump clear of the body of the user so that he can make a full stroke without fatigue and also it vwill prevent the piston rod when extended from coming in contact with the clothing, as by this means the pump cylinder is held a greater `distance away from the body than ,in pumps of the ordinary construction where the feet have to be placed at each side of the cylinder.

In Fig. 4t I have illustrated the two foot plates 16 moved close together and when in vthis position the pump takes comparatively llittle'room in an automobile or other vehicle.

rIn Fig. 10 I 'have shown the two foot plates 16 mounted on a single bolt 20a on which is a Wing nut 21'LL so that the bolt acts as a pivot as well as a clamping'means,

In Fig. 7 I have illustrated the pivot pins 17'a in l.the form of set screws so as to lock the plates in position. In Fig. 8 I have shown the pivots for the foot plates directly under the cylinder. In this instance the two plates are-,geared together and a segment y22 is pivoted at 23 to one of the toot plates and is adjustably held by a wing nut V21b to the other foot plate.

Fig. 9 illustrates al construction somewhat.

simil-ar to Fig. 8 with the exception that the gear teeth of the plates 16b are extended and v,the pin 24 locks the foot vplates in the extended position and when the pin is placed in the hole 25 locks the plates in a closed position as shown by dotted lines in said ligure.

F igure 11 illustrates a fixed foot plate 1G which in the present instance forms part of' the base and a pivot foot plate 16d adjustably held to the fixed plate by a strap 2G and wing nut 22C.

In Fig. 12 I have illustrated the base 2 having lateral extensions 27 and foot plates 16e adjustably secured thereto so that they can be moved to and from the cylinder,

In Figi'. 13 I have shown another modification in which the foot plates 1Gf are of a different shape and are provided with clamp plates and bolts and nuts for holding thcm in different positions on the base.

In Fig. 14 I have shown another modifi. cation in which the foot plates 16K are pivoted at 17g to an extended base on which is a clamp plate 19g held by a bolt 20 and a wing` nut.

In Fig. 22 I have shown the base 2" having integral angular extensions 16" which form ixcd foot plates. The angle of thcse extensions is similar to that illustrated in .Figure 5 and accomplish the same purpose with the exception that they are not movable.

In Figs. 17 and 18 I have illustrated a base 2C having' slots 2S to receive removable toot plates 1Gi which are shaped to enter the slots and to be on a line with the base. As clcarly'shown in Fig. 18, the angular arrancjement of these plates is the same as illustrated in Fig- In Fifr. 19 I have shown a foot plate having; integral angular extensions 16k. The foot plate is pivoted ,to the base .2d at 29 so as to turn up against the front of the cylinder when not in use.

In Figs. 20 and 21 I have shown a similar construction, in which a projecting! vplate 30 is pivotcd at 29n to the base 22 and to which the foot plates 16m are pivotally connected.

In all the figures above described the foot plates are either arranged at an angle projeeting at the front of the pump or must he adjusted so that the foot plates may be arranged at an angle at the front of the pump for the purpose as above described, of holding; the pump cylinder away from the body of the user and so that the base can be rigidly held by the feet of the operator in a natural position. The foot plates are Iliade adjustable vso that they can be packed in a comparatively small space.

I claim 1. The combination of an air pump having a base; a cylinder on said base; two foot plates pivotally mounted on the base, with means whereby the foot plates are operatively `geared together and are free to swing,r in a plane at right angles to the line ot the cylinder.

2. The combination in an air pump of a neer-rire base; a cylinder on said base; two foot plates adjustably mounted on the base having in termeshing teeth whereby movement of one plate is communicated to the other, said ioot plates beingl free to swing in a plane at right angles to the pump cylinder,

3. The combination oir an air pump having, a base and two foot plates pivotally i mounted on the base; means whereby the two foot plates are geared together and are free to swing in a plane at right angles to the line of the cylinder; and means for lookn ing the plates in either the closed or extended position.

Il. The combination of an air pump having a base; two foot plates pivotally mounted on the base; an independent pivot for each foot plate, the two foot plates being `gearedtogether; a clamp plate; a bolt eX- tending through the plate, and a nut on the bolt bearing against the plate to Clamp the foot plates in the position in which they are adjusted.

5. The combination of an air pump having; a base; two foot plates adjustably mounted on the base so as to project radially therefrom; with means for clamping said plates in an adjusted position at an angle to each other.

NlCHOLATJ A. PETRY. 

